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## 4th grade

### Course: 4th grade > Unit 11

Lesson 3: Parallel and perpendicular# Parallel and perpendicular lines review

Review the basics of parallel and perpendicular lines. Identify and draw parallel and perpendicular lines in some practice problems.

## What are ${\text{perpendicular lines}}$ and ${\text{parallel lines}}$ ?

*Want to learn more about parallel and perpendicular lines? Check out this video.*

## Practice set 1: Identify parallel and perpendicular lines

*Want to try more problems like this? Check out this exercise.*

## Practice set 2: Draw parallel and perpendicular lines

*Want to try more problems like this? Check out this exercise.*

## Want to join the conversation?

- Quick question how do you prove that lines are parallel? I can't seem to find that on here and i really need to know!(193 votes)
- If you draw a line through the 2 lines, it should be perpendicular to both lines.(36 votes)

- I am having trouble remember these. Anyone have any tips to help me remember?

Edit : Case Closed. But thank you Taylyn for answering my question! Everyone have a nice day.(39 votes)- Yes. In the word Parallel, the double L's are side by side, and if going on in a straight line, would never touch. So, the double L's in Parallel are, well, parallel. Use those as an example to help you remember what parallel means.(62 votes)

- Are perpendicular any kind of lines that intersect each other? I've got to know this!(24 votes)
- Yes, perpendicular lines intersect each other with 4 90-degree angles.(4 votes)

- Does a perpendicular line ALWAYS have to be 90 degrees? Just a Question(15 votes)
- Yes, a perpendicular line must always be at a 90-degree angle(29 votes)

- does perpendicular line have to be the exactly 90 degrees?(9 votes)
- It always have to be exactly at a right angle, and a right angle is always 90 degrees so yes.(4 votes)

- Why does the human brain have to know what geometry is?(10 votes)
- So it can identify shapes and measure things. It also helps make the human brain grow.

Hope this helps :D(17 votes)

- What happens if a Parallel line goes through a regular line so that make it perpendicular so what is that.(13 votes)
- If the parallel line goes through the line, the lines will not be parallel anymore, so they will only be perpendicular if they meet at a right angle.(10 votes)

- Parallel Lines is two lines thats are the same lines together. (Cant make a picture of it but you can look it up) Notice there's two lines that are crossed? That's Perpendicular! Perpendicular Lines are two Lines that do cross(9 votes)
- Gotta keep ur headup gotta stay strong something aint right but u knowthat were bettertogether say what they want ill be there for u(9 votes)